Wrench.



H. F. LARAVA.

WRENCH. APPLICATION FILED M AY 14. 1908) Patented Oct. 27, 1908.

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HENRY F. LARAVA, OF WORCESTER, MASSACHUSETTS.

WRENCH.

Specification of Letters Patent.

Patented Oct. 27, 1908.

Application filed May 14, 1908. Serial No. 432,841.

To all whom it may concern:

Be it known that I, HENRY F. LARAVA, a citizen of the United States,residing at lllorcester, in the county of wWorcester and State ofMassachusetts, have invented a new and useful lVrench, of which thefollowing is a specification.

This invention relates to a wrench, which while capable of general useto a certain extent, is especially adapted for use in removing fruit jarcovers and the like.

The principal objects of the invention are to prcvide a simple andconvenient construction for this purpose, having a movable jaw which canbe tightened in a very simple manner with the application of a smallamount of force in such a way as to securely clamp the jar cover orother article to be secured, and which can be constructed of a smallnumber of parts, each made in a simple and inexpensive manner.

Further objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings in which i Figure 1is a side elevation of one form of the invention showing how it isapplied to a fruit jar cover; Fig. 2 is a plan of a portion of the same;and Eig. 3 is a view similar to Eig. 2, showing another way in which theinvention may be carried out.

The device is shown as constructed in the forni of a straight barpreferably of sheet metal having a handle 11 at one end, and an integraljaw 12 at the other formed by turning down the end of the bar androunding it if desired to make it correspond with the edge of the jarcover or the like. The inner surface of this jaw may, if desired, beknurled, roughened, or provided with teeth. 0n the bar at a properdistance from the stationary jaw 12 is located a movable jaw 13 which isprovided with sharp teeth extending toward the stationary aw, preferablyof such character as to give the necessary grip at this point so thatthe stationary jaw will not have to be provided with any teeth. This jaw13 is preferably made of a piece of sheet metal and in the form shown inFigs. 1 and 2 it is provided with a rear end 141i and with lips 15extending up over the bar so as to hold the jaw slidably thereon in avery simple and convenient manner, all of said parts of the aw beingformed in one integral piece and stamped out of sheet metal. In order totighten this jaw in position on the jar coverl or the like a wedge isprovided which preferably consists of a screw head 16 extending belowthe bar and provided with a screw 17 extending through a perforationthrough the bar. A thumbnut 18 is provided for tightening up the screw,and a washer 19 for an obvious purpose. This screw is stationed at theproper distance from the stationary jaw so that when the device isapplied to a jar cover or any other article, to which it may be adapted,the loose aw may be tightened up by turning the thumb-screw to draw theconical head of the screw transversely against the rear edge of the jaw13 so as to force it forward slightly and clamp it in position. It willbe seen that by this simple construction, advantage is taken of twosimple mechanical elements, the screw and the wedge, for securing aclamping action, and thus with a small expenditure of energy the jaw isiirmly clamped on the jaw cover.

ln the form of the invention shown in Fig. 3, the parts are illustratedin the same way, except that the jaw 21 is not provided with any ears,but is held on the bar by means of a rivet E22 extending therethrough,and is provided with an elongated slot 23 through which the rivetpasses, so that the jaw may move longitudinally on the bar. The clampingaction is secured in the same way in this case as before.

It will be seen that the invention is capable of being constructed in asimple and convenient manner, and with very small expense, and that theparts are so constructed that a great deal of force can be applied tothe movable aw of the wrench without applying much strength to thethumb-nut.

l/Vhile I have illustrated and described two forms in which theinvention may be carried out, T am aware that many modications may bemade therein by any person skilled in the art without departing from thescope of the invention as expressed in the claims. Therefore, I do notwish to be limited to the particular forms shown, but

That I do claim is 1. As an article of manufacture, a wrench comprisinga straight bar having the end thereof turned down to form an integraljaw of the same width as the bar, and a second jaw slidably mounted onthe bar and comprising a sheet metal plate having teeth in the form ofthe arc of a circle on the side thereof facing said integral jaw andprojecting in opposite directions from the center thereof, and havingintegral ears extending upwardly and lapping over the bar to guide thejaw in its sliding motion thereon.

2. As an article of manufacture, a wrench comprising a bar having ahandle thereon and a transverse jaw at the end thereof, a longitudinallymovable jaw on the bar, a wedge adapted to engage the movable jaw, androtatable means on the bar connected with the wedge for moving ittransversely of the bar to move the movable jaw therealong.

3. As an article of manufacture, a wrench comprising a movable jaw, acone adapted to engage the rear edge of said jaw, a screw on the cone, anut for engaging the screw and moving the cone to move said jaw, and asecond jaw.

4. In a wrench the combination of a straight bar having the end turneddown to form a jaw, a second jaw movably mounted on the bar andcomprising a sheet metal plate having ears extending upwardly andlapping over the bar to hold the j aw in p0- sition, a screw extendingthrough the bar, the head thereof constituting a conical member forengaging the rear of said second jaw, and a nut on the screw on theopposite side of the bar for moving the second jaw toward the firstnamed jaw.

In a wrench the combination of a bar, a jaw thereon, a second j awmovably mounted thereon and having integral lips extending over the edgeof the bar to hold it in position, said bar being perforated at the rearof said movable jaw, a screw extending through the perforations, thehead of the screw constituting a wedge for engaging the movable jaw, anda nut on the screw for moving the movable jaw.

6. The combination with a wrench handle, of a fixed jaw, a movable jaw,a conical member for engaging the rear of the movable jaw, and means fordrawing the cone transversely to move the movable jaw toward the -fixedjaw.

In testimony whereof I have hereunto set my hand, in the presence of twosubscribing witnesses.

HENRY F. LARAVA. lVitnesses:

WILLIAM A. DEAN, DAVID H. DEAN.

